Research On Automatic Fire Alarm System Based On Wireless Sensor Network

With the rapid development of science and technology and social economy,fire has become a natural disaster with high frequency that we are exposed to daily.The traditional fire alarm system adopts wired alarm system,which is not only complicated in construction,complicated in wiring,high in cost,but also difficult in late transformation and weak in expansibility.With the development and use of wireless sensor technology,wireless automatic fire alarm system arises at the historic moment.Wireless automatic fire alarm system integrates the advantages of traditional automatic fire alarm system and wireless sensing technology,which not only avoids the disadvantages of inconvenient installation and layout of traditional wired fire alarm system components,but also reduces the project cost,and the timeliness of fire information transmission is greatly improved.On the basis of combining the causes and characteristics of common fire in modern buildings,this thesis systematically analyzes and studies the action principle and process of software and hardware of wireless sensor network system when fire occurs in modern buildings.By comparing with traditional fire monitoring system,this thesis designs automatic fire alarm system based on wireless sensor network,analyzes and solves several important problems of wireless sensor network in building fire monitoring,and designs the main structure of the system.In order to ensure that the system data can be reliably transmitted and not affected by external factors such as building shape and fire environment,the node and gateway are optimized from hardware module and software module on the basis of integrating previous studies.The hardware part,from the chip selection,related circuit design,material selection and performance analysis and other aspects of the study,and do system integration,in order to achieve the optimal combination of hardware circuits.Software part,from the basic structure and function of ZigBee software analysis,on the basis of z-Stack protocol Stack software and test page design,to achieve the basic function of the system software requirements.Through the smoke alarm system,wireless communication,analyzes and researches on monitoring host node design,can be achieved when the fire broke out,the data of the scene of the fire alarm detector in the system can real-time acquisition,and through the wireless transmission way to pass the fire information in a timely manner to monitor host,monitor host fire alarm inform staff.On the basis of comprehensive research,this thesis chooses C/S network architecture,MySQL database,multi-threaded server,XML file management,using Qt platform for the development of data monitoring center software.Qt software can not only docking received dynamic data for real-time display,but also for historical data query,node information view and edit,alarm value setting,data sharing within the LAN.Finally,the system test and performance analysis of the designed alarm system were carried out in the laboratory,and various situations occurred when the actual fire was simulated by laying out relevant fire scenes.Through the test,the hardware and software circuits of the system can meet the actual requirements and reach the expected design goals.